Piles of debris rising more than 20 feet have been discovered on an illegal dump site in Central Islip, the second such recent discovery in the town of Islip, Suffolk County District Attorney Tom Spota said.

Police are standing guard at the gate of the now-closed Roberto Clemente Park in Brentwood, after Suffolk County District Attorney Tom Spota said about 1,100 truckloads of contaminated debris were dumped there.